psa_crypto_slot_management.h
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1 /*
2  * Copyright (C) 2021 HAW Hamburg
3  *
4  * This file is subject to the terms and conditions of the GNU Lesser
5  * General Public License v2.1. See the file LICENSE in the top level
6  * directory for more details.
7  */
8 
9 #pragma once
10 
23 #ifdef __cplusplus
24 extern "C" {
25 #endif
26 
27 #include "clist.h"
29 
33 #define PSA_PROTECTED_KEY_COUNT (CONFIG_PSA_PROTECTED_KEY_COUNT)
34 
38 #define PSA_ASYMMETRIC_KEYPAIR_COUNT (CONFIG_PSA_ASYMMETRIC_KEYPAIR_COUNT)
39 
43 #define PSA_SINGLE_KEY_COUNT (CONFIG_PSA_SINGLE_KEY_COUNT)
44 
48 #define PSA_KEY_SLOT_COUNT (PSA_PROTECTED_KEY_COUNT + \
49  PSA_ASYMMETRIC_KEYPAIR_COUNT + \
50  PSA_SINGLE_KEY_COUNT)
51 
57 #define PSA_KEY_ID_VOLATILE_MIN (PSA_KEY_ID_VENDOR_MIN)
58 
64 #define PSA_KEY_ID_VOLATILE_MAX (PSA_KEY_ID_VENDOR_MAX)
65 
74 typedef struct {
76  size_t lock_count;
79 #if PSA_SINGLE_KEY_COUNT
80  struct key_data {
81  uint8_t data[PSA_MAX_KEY_DATA_SIZE];
82  size_t data_len;
83  } key;
84 #endif /* PSA_SINGLE_KEY_COUNT */
86 
87 #if PSA_PROTECTED_KEY_COUNT
94 typedef struct {
95  clist_node_t node;
96  size_t lock_count;
98  struct prot_key_data {
99  psa_key_slot_number_t slot_number;
100 #if IS_USED(MODULE_PSA_ASYMMETRIC)
101  uint8_t pubkey_data[PSA_EXPORT_PUBLIC_KEY_MAX_SIZE];
102  size_t pubkey_data_len;
103 #endif
104  } key;
105 } psa_prot_key_slot_t;
106 #endif /* PSA_PROTECTED_KEY_COUNT */
107 
108 #if PSA_ASYMMETRIC_KEYPAIR_COUNT
115 typedef struct {
116  clist_node_t node;
117  size_t lock_count;
119  struct key_pair_data {
121  uint8_t privkey_data[PSA_BITS_TO_BYTES(PSA_MAX_PRIV_KEY_SIZE)];
123  size_t privkey_data_len;
125  uint8_t pubkey_data[PSA_EXPORT_PUBLIC_KEY_MAX_SIZE];
127  size_t pubkey_data_len;
128  } key;
129 } psa_key_pair_slot_t;
130 #endif /* PSA_ASYMMETRIC_KEYPAIR_COUNT */
131 
136 
145 static inline int psa_key_id_is_volatile(psa_key_id_t key_id)
146 {
147  return ((key_id >= PSA_KEY_ID_VOLATILE_MIN) &&
148  (key_id <= PSA_KEY_ID_VOLATILE_MAX));
149 }
150 
158 static inline int psa_is_key_slot_locked(psa_key_slot_t *slot)
159 {
160  return (slot->lock_count > 0);
161 }
162 
170 
180 {
182 }
183 
193 
198 
210 
218 
230  const psa_key_attributes_t *attr,
231  psa_key_slot_t **p_slot);
232 
242 
252 
263  psa_se_drv_data_t **driver);
264 
274 
284 int psa_is_valid_key_id(psa_key_id_t id, int vendor);
285 
296  uint8_t **key_data,
297  size_t **key_bytes);
298 
307  uint8_t **pubkey_data,
308  size_t **pubkey_data_len);
309 
310 #ifdef __cplusplus
311 }
312 #endif
313 
Circular linked list.
uint64_t psa_key_slot_number_t
Encoding of a key slot number on a secure element.
int psa_is_valid_key_id(psa_key_id_t id, int vendor)
Check if provided key ID is either a valid user ID or vendor ID.
psa_status_t psa_lock_key_slot(psa_key_slot_t *slot)
Increase lock count.
#define PSA_KEY_ID_VOLATILE_MAX
Maximum key id for volatile keys.
void psa_init_key_slots(void)
Initializes the allocated key slots and prepares the internal key slot lists.
static int psa_is_key_slot_locked(psa_key_slot_t *slot)
Check whether a key slot is locked.
static int psa_key_lifetime_is_external(psa_key_lifetime_t lifetime)
Check whether a key is stored on an external device.
psa_status_t psa_validate_key_persistence(psa_key_lifetime_t lifetime)
Validate key persistence.
psa_status_t psa_get_and_lock_key_slot(psa_key_id_t id, psa_key_slot_t **slot)
Find a key slot in local memory and lock it.
psa_status_t psa_validate_key_location(psa_key_lifetime_t lifetime, psa_se_drv_data_t **driver)
Check if key location exists.
psa_status_t psa_wipe_key_slot(psa_key_slot_t *slot)
Wipe volatile key slot and its contents.
#define PSA_KEY_ID_VOLATILE_MIN
Minimum key id for volatile keys.
psa_status_t psa_persist_key_slot_in_storage(psa_key_slot_t *slot)
Store a key slot in persistent storage.
psa_status_t psa_allocate_empty_key_slot(psa_key_id_t *id, const psa_key_attributes_t *attr, psa_key_slot_t **p_slot)
Find a currently empty key slot that is appropriate for the key.
psa_status_t psa_unlock_key_slot(psa_key_slot_t *slot)
Decrease lock count.
psa_key_slot_number_t * psa_key_slot_get_slot_number(const psa_key_slot_t *slot)
Get slot number in protected memory.
void psa_get_public_key_data_from_key_slot(const psa_key_slot_t *slot, uint8_t **pubkey_data, size_t **pubkey_data_len)
Get public key data and size from key slot.
void psa_wipe_all_key_slots(void)
Wipe all existing volatile key slots.
static int psa_key_id_is_volatile(psa_key_id_t key_id)
Check whether a key identifier is a volatile key identifier.
size_t psa_get_key_data_from_key_slot(const psa_key_slot_t *slot, uint8_t **key_data, size_t **key_bytes)
Get key data and key size from key slot.
uint32_t psa_key_id_t
Key identifier.
Definition: id.h:36
#define PSA_MAX_PRIV_KEY_SIZE
The maximum size of an asymmetric private key.
Definition: sizes.h:140
#define PSA_MAX_KEY_DATA_SIZE
The maximum size of the used key data.
Definition: sizes.h:268
#define PSA_EXPORT_PUBLIC_KEY_MAX_SIZE
Sufficient buffer size for exporting any asymmetric public key.
Definition: sizes.h:246
#define PSA_KEY_LOCATION_LOCAL_STORAGE
The local storage area for persistent keys.
Definition: lifetime.h:201
#define PSA_KEY_LIFETIME_GET_LOCATION(lifetime)
Extract the location indicator from a key lifetime.
Definition: lifetime.h:244
uint32_t psa_key_lifetime_t
Encoding of key lifetimes.
Definition: lifetime.h:66
int32_t psa_status_t
Status code type used for all PSA Certified APIs.
Definition: error.h:40
PSA Secure Element management function declarations.
#define PSA_BITS_TO_BYTES(bits)
Functions to convert bits to bytes.
Definition: sizes.h:35
List node structure.
Definition: list.h:36
Structure storing key attributes.
Definition: attributes.h:51
Structure of a virtual key slot in local memory.
clist_node_t node
List node to link slot in global list.
psa_key_attributes_t attr
Attributes associated with the stored key.
size_t lock_count
Number of entities accessing the slot.
Structure containing secure element driver data and contexts.